[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5303/JKAS.2020.53.4.87

TOWARD A NEXT GENERATION SOLAR CORONAGRAPH: DIAGNOSTIC CORONAGRAPH EXPERIMENT

Cho, Kyung-Suk (Korea Astronomy and Space Science Institute)
Yang, Heesu (Korea Astronomy and Space Science Institute)
Lee, Jae-Ok (Korea Astronomy and Space Science Institute)
Bong, Su-Chan (Korea Astronomy and Space Science Institute)
Kim, Jihun (Korea Astronomy and Space Science Institute)
Choi, Seonghwan (Korea Astronomy and Space Science Institute)
Park, Jongyeob (Korea Astronomy and Space Science Institute)
Cho, Kyuhyoun (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Baek, Ji-Hye (Korea Astronomy and Space Science Institute)
Kim, Yeon-Han (Korea Astronomy and Space Science Institute)
Park, Young-Deuk (Korea Astronomy and Space Science Institute)

Publication Information

Journal of The Korean Astronomical Society / v.53, no.4, 2020 , pp. 87-98 More about this Journal

Abstract

The Korea Astronomy and Space Science Institute (KASI) has been developing a next-generation coronagraph (NGC) in cooperation with NASA to measure the coronal electron density, temperature, and speed simultaneously, using four different optical filters around 400 nm. KASI organized an expedition to demonstrate the coronagraph measurement scheme and the instrumental technology during the 2017 total solar eclipse (TSE) across the USA. The observation site was in Jackson Hole, Wyoming, USA. We built an eclipse observation system, the Diagnostic Coronal Experiment (DICE), composed of two identical telescopes to improve the signal-to-noise ratio. The observation was conducted at four wavelengths and three linear polarization directions in the limited total eclipse time of about 140 seconds. We successfully obtained polarization data for the corona but we were not able to obtain information on the coronal electron temperature and speed due to the low signal-to-noise ratio of the optical system and strong emission from prominences located at the western limb. In this study, we report the development of DICE and the observation results from the eclipse expedition. TSE observation and analysis with our self-developed instrument showed that a coronagraph needs to be designed carefully to achieve its scientific purpose. We gained valuable experience for future follow-up NASA-KASI joint missions: the Balloon-borne Investigation of the Temperature and Speed of Electrons in the Corona (BITSE) and the COronal Diagnostic EXperiment (CODEX).

Keywords

Sun: corona; solar wind; telescopes; space vehicles: instruments;

Citations & Related Records

Reference

1	Antiochos, S. K., Mikic, Z., Titov, V. S., et al. 2011, A Model for the Sources of the Slow Solar Wind, ApJ, 731, 112 DOI
2	ASTM E490-00a 2000, Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables (West Conshohocken, PA: ASTM International), www.astm.org
3	Baumbach, S. 1937, Strahlung, Ergiebigkeit und Elektronendichte der Sonnenkorona, AN, 263, 121
4	Billings, D. E. 1966, A Guide to the Solar Corona (New York: Academic Press)
5	Brueckner, G. E., Howard, R. A., Koomen, M. J., et al. 1995, The Large Angle Spectroscopic Coronagraph (LASCO), Sol. Phys., 162, 357 DOI
6	Cho, K., Chae, J., Lim, E.-K., et al. 2016, A New Method to Determine Temperature of CMEs Using a Coronagraph Filter System, JKAS, 49, 45
7	Cho, K.-S., Bong, S.-C., Choi, S., et al. 2017, Toward a Next Generation Solar Coronagraph: Development of a Compact Diagnostic Coronagraph on the ISS, JKAS, 50, 139
8	Cram, L. E. 1976, Determination of the Temperature of the Solar Corona from the Spectrum of the Electron-Scattering Continuum, Sol. Phys., 48, 3 DOI
9	Howard, R. A., Moses, J. D., Vourlidas, A., et al. 2007, Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI), Space Sci. Rev., 136, 67 DOI
10	Ichimoto, K., Kumagai, K., Sano, I., et al. 1996, Measurement of the Coronal Electron Temperature at the Total Solar Eclipse on 1994 November 3, PASJ, 48, 545 DOI
11	Lu, L., Inhester, B., Feng, L., et al. 2017, Measure the Propagation of a Halo CME and Its Driven Shock with the Observations from a Single Perspective at Earth, ApJ, 835, 188 DOI
12	McComas, D., Wilmot, J., & Cudmore, A., 2016, The Core Flight System (cFS) Community: Providing Low Cost Solutions for Small Spacecraft, 30th Annual AIAA/USU Conference on Small Satellites, Salt Lake City
13	Reginald, N. L., Davila, J. M., St. Cyr, O. C., & Rabin, D. M., 2017, Electron Temperature Maps of the Low Solar Corona: ISCORE Results from the Total Solar Eclipse of 1 August 2008 in China, J. Geophys. Research: Space Phys., 122, 5856 DOI
14	Reginald, N. L. 2001, MACS, an Instrument, and a Methodology for Simultaneous and Global Measurements of the Coronal Electron Temperature and the Solar Wind Velocity on the Solar Corona, PhD Thesis, University of Delaware, Source DAI-B 61/12, 6516
15	Reginald, N. L., Davila, J. M., & St. Cyr, O. C., 2004, The Eects of Streamers on the Shape of the K-Coronal Spectrum, Sol. Phys., 225, 249 DOI